Lincoln regretfully declines an invitation to attend the Osawatomie convention on May 18, 1859, which was to formally organize the Republican Party in Kansas. Lincoln warns against "the temptation to lower the Republican Standard [in whatever platform the convention might adopt] in order to gather recruits. "In my judgment," Lincoln continues, "such a step would be a serious mistake" that "would surrender the object of the Republican organization-- preventing the Spread and Nationalization of Slavery." This two-page, handwritten copy of a letter sent by Abraham Lincoln to Mark Delahay was probably given to the Kansas Historical Society by Delahay's daughter, Mary E. Delahay, in the early 1900s.